The constructor for a LuaLogService object (creates a new LuaLogService).
IMPORTANT: Do not create a new log service to write messages to log types that are defined in the NiFi Ingest configuration file. Instead use the same log service as NiFi Ingest, by calling get_log_service, or obtain a LuaLog object through the function get_log.
LuaLogService:new( config )
| Argument | Description |
|---|---|
config
|
(LuaConfig) The configuration object to read the logging settings from. You can obtain a LuaConfig object through the function get_config. |
(LuaLogService). The new LuaLogService object.
The following example creates a LuaLogService object to write log messages to a custom log file named lua.log. Declare the log service globally to avoid a LuaLogService object being created every time the script runs. For example, if you are writing a Lua script to use with a connector or CFS, create the LuaLogService outside the handler function. Otherwise, the server creates a LuaLogService object for every document that is processed.
local luaConfigString = [===[
[Logging]
LogLevel=FULL
0=LuaLogStream
[LuaLogStream]
LogTypeCSVs=lua
LogFile=lua.log
]===]
local config = LuaConfig:new(luaConfigString)
-- global log service instance for Lua log stream
luaLogService = LuaLogService:new(config)
local luaLog = luaLogService:get_log("lua")
luaLog:write_line(log_level_normal(), "running Lua script")
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